From owner-freebsd-arch@FreeBSD.ORG Sun Mar 20 16:11:31 2011 Return-Path: Delivered-To: arch@freebsd.org Received: from mx1.freebsd.org (mx1.freebsd.org [IPv6:2001:4f8:fff6::34]) by hub.freebsd.org (Postfix) with ESMTP id 8A1DC106566C for ; Sun, 20 Mar 2011 16:11:31 +0000 (UTC) (envelope-from alexander@leidinger.net) Received: from mail.ebusiness-leidinger.de (mail.ebusiness-leidinger.de [217.11.53.44]) by mx1.freebsd.org (Postfix) with ESMTP id 4C5678FC13 for ; Sun, 20 Mar 2011 16:11:31 +0000 (UTC) Received: from outgoing.leidinger.net (p5B154CFB.dip.t-dialin.net [91.21.76.251]) by mail.ebusiness-leidinger.de (Postfix) with ESMTPSA id 1B0A784400E; Sun, 20 Mar 2011 17:11:24 +0100 (CET) Received: from unknown (IO.Leidinger.net [192.168.2.110]) by outgoing.leidinger.net (Postfix) with ESMTP id 679233F86; Sun, 20 Mar 2011 17:11:21 +0100 (CET) Date: Sun, 20 Mar 2011 17:11:22 +0100 From: Alexander Leidinger To: George Neville-Neil Message-ID: <20110320171122.00004613@unknown> In-Reply-To: <72B8E80C-E4C7-4763-A7B5-7A4441188C00@neville-neil.com> References: <132388F1-44D9-45C9-AE05-1799A7A2DCD9@neville-neil.com> <20110319160400.000043f5@unknown> <72B8E80C-E4C7-4763-A7B5-7A4441188C00@neville-neil.com> X-Mailer: Claws Mail 3.7.8cvs47 (GTK+ 2.16.6; i586-pc-mingw32msvc) Mime-Version: 1.0 Content-Type: text/plain; charset=US-ASCII Content-Transfer-Encoding: 7bit X-EBL-MailScanner-Information: Please contact the ISP for more information X-EBL-MailScanner-ID: 1B0A784400E.A4BA8 X-EBL-MailScanner: Found to be clean X-EBL-MailScanner-SpamCheck: not spam, spamhaus-ZEN, SpamAssassin (not cached, score=-1, required 6, autolearn=disabled, ALL_TRUSTED -1.00) X-EBL-MailScanner-From: alexander@leidinger.net X-EBL-MailScanner-Watermark: 1301242288.46085@xUJcTwz/SLbx6RfgADbZIA X-EBL-Spam-Status: No Cc: arch@freebsd.org Subject: Re: Updating our TCP and socket sysctl values... X-BeenThere: freebsd-arch@freebsd.org X-Mailman-Version: 2.1.5 Precedence: list List-Id: Discussion related to FreeBSD architecture List-Unsubscribe: , List-Archive: List-Post: List-Help: List-Subscribe: , X-List-Received-Date: Sun, 20 Mar 2011 16:11:31 -0000 On Sun, 20 Mar 2011 12:45:45 +0900 George Neville-Neil wrote: > -----BEGIN PGP SIGNED MESSAGE----- > Hash: SHA1 > > > On Mar 20, 2011, at 00:04 , Alexander Leidinger wrote: > > > On Sat, 19 Mar 2011 15:37:47 +0900 George Neville-Neil > > wrote: > > > >> -----BEGIN PGP SIGNED MESSAGE----- > >> Hash: SHA1 > >> > >> Howdy, > >> > >> I believe it's time for us to upgrade our sysctl values for TCP > >> sockets so that they are more in line with the modern world. At > >> the moment we have these limits on our buffering: > >> > >> kern.ipc.maxsockbuf: 262144 > >> net.inet.tcp.recvbuf_max: 262144 > >> net.inet.tcp.sendbuf_max: 262144 > >> > >> I believe it's time to up these values to something that's in line > >> with higher speed local networks, such as 10G. Perhaps it's time > >> to move these to 2MB instead of 256K. > >> > >> Thoughts? > > > > I suggest to read > > http://www.bufferbloat.net/projects/bloat/wiki/Bufferbloat > > and do a before/after test to make sure we do not suffer from the > > described problem. Jim Getty has test descriptions: > > http://gettys.wordpress.com/category/bufferbloat/ > > > > No need to read those, I heard him talk about it at dinner a > few weeks ago. What he's mostly talking about is buffer bloat Great. > in non endpoint devices. Note that I'm not talking about changing I had the impression that this can also be an issue with e.g. your laptop connected to a WLAN. Bye, Alexander.